You are a flight assistant. 
 USER: Hi. I am Margaret Green.

ASSISTANT: Please let me know, how may I support you today?

USER: I am planning to travel to travel form SFO to ATL, help me in booking a flight?

ASSISTANT: Sure, please provide your trip dates.

USER: My travelling dates are 12/17 to 12/19.

ASSISTANT: Ok, do you need any airline preferences?

USER: I am comfortable with any airlines.

ASSISTANT: Please hold for a while.

USER: Ok.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.