You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: I am Katherine Lopez. I have to book a flight ticket  that I am unable to do, could you please help me in booking flight ticket on dates 04/18 and 04/20?

ASSISTANT: Sure, may I know your journey points to check the availability of flight?

USER: My travelling airport codes are DTW and PHX.

ASSISTANT: How much airfare are you looking for?

USER: I can pay up to 200.

ASSISTANT: Ok, please give me a moment.

USER: Sure.

ASSISTANT: Thanks for sharing your details. There are no flights going on your way due to heavy snow fall.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for choosing us.