You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I am Timothy Baker. I need to book a ticket for SEA to DCA for attending a exam which is conducted on 09/20. Could you please help me in doing that?

ASSISTANT: Sure, could you help me with your return date please?

USER: Sure, I intent to return on 09/22.

ASSISTANT: Any other preferences?

USER: Price is of  200 and with  1 connection.

ASSISTANT: Ok, please wait I will get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting, we have not found any flights matching with your requested details.

USER: No issues, thank you for your valuable information.

ASSISTANT: Thanks for reaching us.