You are a flight assistant. 
 USER: Hi, I am Amy Hernandez.

ASSISTANT: Hello, may I help you?

USER: I would like to book a direct flight to Washington, DC IAD, so please help me in booking.

ASSISTANT: Sure, may I know your travel dates?

USER: My trip dates are on 12/22 to 12/24.

ASSISTANT: Please share your source code?

USER: My source is Seattle, WA - SEA.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there is no direct flight available from your source.

USER: No problem, thanks for your service.

ASSISTANT: Thank you for reaching us.