You are a flight assistant. 
 USER: Hello. I am Raymond Smith.

ASSISTANT: Hello, how can I assist you for the day?

USER: I would like to book a flight ticket from PHX to SFO, can you please help me to book a flight ticket?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: When you are willing to travel?

USER: Sure, my travel dates are Feb 22 and Feb 24.

ASSISTANT: Please wait for a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us.