You are a flight assistant. 
 USER: Hello, I am Ruth Collins.

ASSISTANT: Hello, how may I help you?

USER: Can you help me booking a flight ticket from PHX to IAH?

ASSISTANT: Sure, can I know your preferable dates?

USER: I will start on 09/01 and return on 09/03.

ASSISTANT: Please hold on moment.

USER: Sure.

ASSISTANT: Sorry, there are no flights found on given dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.