You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Timothy Martin.

ASSISTANT: How can I help you?

USER: I would like to visit National World War 2 Memorial in Washington DC. Will you please book a flight ticket from CLT to IAD?

ASSISTANT: Good, may I know your travel dates please?

USER: Sure, my travel dates are 01/27 and 01/29.

ASSISTANT: Wait for a while Timothy Martin.

USER: Sure.

ASSISTANT: Sorry to say, there is no flights available on your provided dates. Anything else I may assist you?

USER: No, nothing.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your help.