You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: John Thomas here.

ASSISTANT: How can I aid you at this moment?

USER: I need your help in booking of a flight ticket from PHX to CLT for an important business meeting, can you please help me out with booking of a flight ticket on those locations?

ASSISTANT: Sure, I will help you in booking flight ticket. Could you please mention your preferable travel dates for booking flight ticket?

USER: Thank you. I am planning to leave on 11/18 and please book my return ticket on 11/20.

ASSISTANT: Just give me a moment, I will check is there any flight available or not in this route as per your requested dates.

USER: Ok, take your time.

ASSISTANT: Sorry for the inconvenience no flights available in this route as per your requested dates.

USER: Oh! Sad to hear that. Anyway, I will choose another alternative to go there. Thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Welcome.