You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I render you today?

USER: I want to travel to Detroit, MI - DTW. Can you please help with my ticket booking?

ASSISTANT: Sure, I am here to help you. Will you please share the journey dates?

USER: My journey dates are 01/27 and 01/29.

ASSISTANT: Can you send your name please?

USER: My name is Katherine Brown.

ASSISTANT: Please share the departure place.

USER: It is Atlanta, GA - ATL.

ASSISTANT: Ok, we found a flight with a fare of 300. Flight number is 1009. Shall I proceed to book?

USER: I can only pay up to 200. Do you have any coupon which we can apply?

ASSISTANT: As of now, there is no chance to apply coupons.

USER: In that case please don't book it.

ASSISTANT: Ok.

USER: Thank you anyway.

ASSISTANT: Thank you.