You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: My name is Angela Clark.

ASSISTANT: Nice to meet you Angela.

USER: I want to book a flight ticket from CA - SFO to TX - HOU to meet my old friend. Please help me in that.

ASSISTANT: Yes, please tell me your travel dates?

USER: My travel dates are from 09/02 to 09/04.

ASSISTANT: Thank you for waiting Angela. But sorry to inform you that presently there are no flights available with us.

USER: No problem, I will find my alternative.

ASSISTANT: Ok, not a problem.

USER: Thank you for your information.

ASSISTANT: Thank you.