You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Gary Wilson. I would like to visit Washington DC on a business trip, can you please book a flight from SEA to IAD?

ASSISTANT: Sure, please provide me your travel dates?

USER: Sure, my travel dates are 03/03 and 03/05. Please check with connection 1.

ASSISTANT: Ok, please wait for a minute.

USER: Sure, take your time.

ASSISTANT: Sorry Gray, I cannot find any flight with your requirements.

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

ASSISTANT: It's my pleasure.