You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you please book the ticket from PHX to IAH? As I'm planning to visit Houston.

ASSISTANT: Your travelling dates please?

USER: Sure, I would like to depart from my source location on 7th Dec and I want to return back by 9th Dec.

ASSISTANT: Do you have any connection limit?

USER: I prefer single connected flight.

ASSISTANT: Is there any specifications?

USER: No, I don't have any other specifications. Are we still connected?

ASSISTANT: May I know your name please?

USER: My name is Melissa Brown.

ASSISTANT: I am sorry no flights found on your route.

USER: That's ok, thank you for giving the information anyways.

ASSISTANT: Thank you for choosing us.