You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I am Christopher Thomas, I want to book a flight ticket to ORD from IAD in the month of January.

ASSISTANT: Sure, I will help you out.

USER: Thank you.

ASSISTANT: May I know your travelling dates please?

USER: Sure, my travelling dates are 01/11 and 01/13.

ASSISTANT: Sorry, there are no flights found in our database.

USER: Not an issue, anyway thank you for the information.

ASSISTANT: Thank you for choosing us.