You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Patricia Evans here.

ASSISTANT: Good evening Evans.

USER: I want to travel from Houston to Phoenix for attending a seminar. Can you please help me for booking the flight ticket?

ASSISTANT: Sure Evans, please provide me your respective airport codes of journey.

USER: My airport codes are from IAH to PHX.

ASSISTANT: May I know your planned journey dates?

USER: My departure date is 02/25 return date is 02/27.

ASSISTANT: Evans, there are no flights available at this moment.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us.