You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: Michael Collins here. My brother's son will be baptized on 12/13, so I need to attend the ceremony in Seattle. Can you hold me a ticket within price 200?

ASSISTANT: Sure, please share your airport codes?

USER: I will start from IAD and land at SEA.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, no flights are available with your request.

USER: Ok, no issue. Thank you for your time.

ASSISTANT: Thanks for opting us,  have a nice day.