You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I amend you today?

USER: I am Anthony Lopez. Please book a flight on 03/20.

ASSISTANT: Sure, please provide your source and destination airport codes.

USER: Sure. Seattle, SEA is my source to start. Austin, AUS is destination.

ASSISTANT: Ok, Kindly mention your return date.

USER: I will return from holiday trip on 03/22.

ASSISTANT: Ok, May I know your price limit?

USER: 200 is fare.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting.

USER: Ok.

ASSISTANT: Sorry, we found a flight in AA airline with price 300 which does not suits to your requirements.

USER: Ok, Thanks for sharing the information.

ASSISTANT: Ok, Thank you for choosing us.