You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Christopher King.

ASSISTANT: How may I help you?

USER: All of our friends are planning for a trip, would you help me in booking a ticket?

ASSISTANT: Certainly, may I know your trip locations for booking flight ticket?

USER: It's from PHX to ATL.

ASSISTANT: Can you help me with your trip dates for booking flight ticket?

USER: I want to travel from 03/10 to 03/12.

ASSISTANT: Please wait a moment Christopher King, I will inform you details.

USER: OK.

ASSISTANT: Sorry to inform you Christopher King, No flights available as per your requested dates.

USER: That's OK. Thank you for your time.

ASSISTANT: Your welcome Christopher King.