You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Myself Dorothy Turner. I want to go Denver for attending a birthday party, can you please book a flight ticket from LGA airport?

ASSISTANT: Sure, can you please tell me your destination airport code?

USER: My destination airport is DEN.

ASSISTANT: Ok, may I know your travelling dates?

USER: I want to take off from New York on 06/29 and please book my return ticket also on 07/01.

ASSISTANT: There are no flights on your requested dates.

USER: It's ok no problem, I will go with another airline. Thank you for your information.

ASSISTANT: Thank you.