You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you please help me in booking my ticket from IAD to SFO?

ASSISTANT: Sure, can you please help me with your travel dates?

USER: Sure, my travelling dates are from 11/13 to 11/15.

ASSISTANT: Do you have any specifications?

USER: Yes, I need a single connecting flight.

ASSISTANT: May I know your name?

USER: Myself Lisa Green.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your route.

USER: It's ok, thank you for your help.

ASSISTANT: Thank you for reaching us.