You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I need to travel from PHL to DEN, can you help me?

ASSISTANT: Sure. Tell me your travel dates please?

USER: My trip dates are 02/08 and 02/10.

ASSISTANT: May I know your name please?

USER: I am Edward Jones.

ASSISTANT: Are you looking for a stopover in your journey?

USER: I need a direct flight.

ASSISTANT: Any other preferences?

USER: My return time must be in evening.

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available in the evening time.

USER: That's ok. Thank you for your help.

ASSISTANT: Thank you.