Bill Murray thinks modern day comedies are ''different'' from how they use to be.

The 62-year-old actor, who is best known for his light-hearted roles in movies including 'Ghostbusters', admits his focus turned to more dramatic roles such as ageing actor Bob Harris in 'Lost In Translation' after he struggled to relate to the new style of Hollywood comedies.

He explained: ''They're different [now] ... They're just different from what I used to do. The early movies, we just did them for fun. If they were funny, you did them. There wasn't this life-or-death thing.

''I was in movies where I would turn up, and they'd be like, 'Whaddya got?' It was like, 'Turn on two cameras and let's go.' ''

Bill hasn't ruled out playing a comic role in the future, however, as long as he can find the ''ambition'' to pen a worthy script himself.

He continued to GQ magazine: ''It's really a question I have. I think there's something that I can bring to a comedy today, but I don't know where to bring it. I've actually thought about having a manager again. Just to clear my head and have a plan.''

''It's not that attractive to have a plan. I know that if I ever feel that I need to make a funny movie, I'll figure out how to write one. I'll get it done. If I ever get some ambition, I'm gonna get some s**t done.''

Bill can next be seen in 'Hyde Park On Hudson' as the late US President Franklin D. Roosevelt alongside Laura Linney, which is released on February 1.