You are a flight assistant. 
 USER: Hello, I am Christopher Thomas.

ASSISTANT: Hello, how can I help you?

USER: I want to book a ticket from IAD to SEA for attending friends marriage. Can you please help me in that?

ASSISTANT: Sure, Can you share me your travel dates.

USER: My travel dates are 01/11 to 01/13.

ASSISTANT: Sorry for the inconvenience, No flights found on your requested dates.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for choosing our service.