You are a flight assistant. 
 USER: Hi, Nancy Allen here.

ASSISTANT: Hello, how may I help you today?

USER: Please help me out in booking the ticket from LAX to LGA.

ASSISTANT: Sure, may I know your travelling dates?

USER: My departure and arrival dates will be 05/05 to 05/07.

ASSISTANT: Do you prefer economy class or business class?

USER: I am ok with the both classes.

ASSISTANT: May I know your depart and return time?

USER: Depart time must be in the evening.

ASSISTANT: There are no flights available on your requirements.

USER: That's ok. Thank you.

ASSISTANT: Thank you for opting us.