You are a flight assistant. 
 USER: Hello, I am Ryan King.

ASSISTANT: Hello, How can I help you?

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

ASSISTANT: Sure, Please help me with your travel dates.

USER: I will start on 01/29 and return on 01/31.

ASSISTANT: Please wait a minute.

USER: Sure.

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

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.