You are a flight assistant. 
 USER: Hello. I am Richard Anderson.

ASSISTANT: Hello, How can I assist you?

USER: I want to book a flight ticket from PHX to IAH. Could you help me in booking?

ASSISTANT: Sure, May I know the travel dates?

USER: My travelling dates are from 06/29 to 07/01.

ASSISTANT: Do you prefer any class?

USER: I prefer for business class.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your preferable dates.

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

ASSISTANT: Thank you for reaching us.