You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Dennis Edwards.

ASSISTANT: How may I help you?

USER: I want to book a ticket from PHX to JFK to attend seminar, can you help me in booking?

ASSISTANT: Sure, may I know your trip dates?

USER: I am departing on Nov 22 and return on Nov 24.

ASSISTANT: Ok, may I know your class preference?

USER: I am ok with any class.

ASSISTANT: Ok, may I know your departure and arrival timings?

USER: I want to depart in evening.

ASSISTANT: Sorry to inform you that there is no flight available as per your requirements.

USER: That's ok, thank yo for your information.

ASSISTANT: You are welcome and thank you for choosing us.