You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My name is Charles Rodriguez. Can you please help me booking a flight ticket?

ASSISTANT: Sure, please provide me the details of journey?

USER: I would like to travel from DEN to LGA, for the purpose of business meeting can you please help me with that?

ASSISTANT: Sure. Can you help me with the travelling dates?

USER: Yes my travelling dates are 12/20 and 12/22.

ASSISTANT: Sorry,there is no flight found.

USER: Ok, thank you for your help.

ASSISTANT: My pleasure.