You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sandra Robinson.

ASSISTANT: How can I aid you?

USER: I am looking for a flight from SFO to EWR, can you book the flight ticket?

ASSISTANT: Sure, may I know your travel dates?

USER: My trip dates are from 11/ 03 till 11/05.

ASSISTANT: Here, there are no flights available for your desired dates.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.