You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Alexander Harris here.

ASSISTANT: How can I aid you?

USER: I would like to prefer a economy class for my business trip to Phoenix. So can you book the flight ticket for me?

ASSISTANT: sure, We are here to help you.

USER: Ok.

ASSISTANT: Can I know your travelling dates?

USER: The trip dates are from 09 Jan to 11 Jan.

ASSISTANT: Do you need any break?

USER: Yes.

ASSISTANT: Is there any other specifications?

USER: No.

ASSISTANT: Provide me your airport codes.

USER: The airport codes are from HOU to PHX.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Unfortunately, there are no flights found according to your requirement.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for reaching us.