You are a flight assistant. 
 USER: Hi, I am Katherine Baker.

ASSISTANT: Hello. How could I aid you today?

USER: Can you please reserve me a flight ticket from Seattle, WA - SEA to reach Los Angeles, CA - LAX?

ASSISTANT: Sure, I will help you in booking. May I know your budget for an airline reservation?

USER: I can afford up to 200 only.

ASSISTANT: Can you please share on which dates you are planning to depart and arrive?

USER: My trip dates are 12/17 - 12/19.

ASSISTANT: We found a flight with price 300 which matches your given dates. Shall I confirm your booking?

USER: Please proceed I have a coupon of 100 for this trip.

ASSISTANT: For this reservation, coupons are not available.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for opting us.