You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: Can you help me to reserve a flight ticket from SFO to IAD?

ASSISTANT: Sure, share me your trip dates please?

USER: My travelling dates are 01 and 03 of Aug.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight.

ASSISTANT: May I know your name please?

USER: I am Rebecca Collins.

ASSISTANT: Sorry, no flights were found in your desired routes.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for reaching us.