You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Patricia Thomas. Will you help me in booking a flight ticket to Seattle,SEA?

ASSISTANT: Sure, can you please let me know your travel dates?

USER: Sure. I will travel on 09/20 and return on 09/22.

ASSISTANT: May I know your origin airport code?

USER: I am starting from Washington, IAD to meet my nephew on the occasion of birthady.

ASSISTANT: May I know your fare limit?

USER: I can afford an amount of 200.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: No flights were available on your particular dates of journey.

USER: Thank you for sharing the information, I will go for other alternative.

ASSISTANT: Thank you for opting us.