You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jason Thomas.

ASSISTANT: How may I assist you today?

USER: Can you please book a flight ticket from DCA to MSP?

ASSISTANT: Sure, please provide me your travel dates.

USER: Sure, I need to travel on dates of 12/09 and 12/11.

ASSISTANT: I could not find any flight with your travel dates.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: My pleasure.