You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to attend a Seminar in New York. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, may I know your name please?

USER: My name is Robert Moore.

ASSISTANT: Now share your travel dates please?

USER: My travelling dates are Jan 29 and Jan 31.

ASSISTANT: Your airport codes please?

USER: My airport codes are DEN and LGA.

ASSISTANT: Do you have a class preference?

USER: I want to travel in economy class.

ASSISTANT: Please wait.

USER: Ok, I want to return on evening.

ASSISTANT: Sure, just a minute.

USER: Ok, I will wait.

ASSISTANT: Thanks for waiting. Sorry to tell you that presently there are no flights found in the evening time.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you.