You are a flight assistant. 
 USER: Hello, I am Timothy Turner.

ASSISTANT: Hello, how may I aid you?

USER: I would like to attend pioneer festivals at San Francisco, CA - SFO. Can you help me in booking a flight ticket?

ASSISTANT: Sure. May I know where are you starting from?

USER: I want to fly from Washington, DC - IAD.

ASSISTANT: Do you need a connection with in your route?

USER: Yes, I need a halt.

ASSISTANT: Please let me know your travelling dates.

USER: My travelling dates are from 03/27 to 03/29.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for providing your details.

USER: It's ok.

ASSISTANT: We did not find any flights at this moment.

USER: That's alright, not a problem. Thank you for your information.

ASSISTANT: Thank you for choosing our service.