You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Gary Lee.

ASSISTANT: I am here to assist you. Ok, may I know your concern?

USER: I am a scientist and there is a meeting for all the members in Phoenix, so I have to attend the meeting. Can you please help me in flight ticket booking from IAD to PHX?

ASSISTANT: Yes, I will help you with that. May I know your travel dates please to check the flights?

USER: Thank you for considering my request and my dates are on 03/26 and 03/28.

ASSISTANT: Sorry, there are no flights available at your location.

USER: Sad to hear that one from your end but thank you for your information.

ASSISTANT: Thank you for connecting with our agency.

USER: Welcome.