You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

USER: Can you please help me to book a flight ticket from PHX to HOU?

ASSISTANT: Sure, I am here to help you with that. May I know your travelling dates?

USER: Thank you. My travel dates are Dec 26 and Dec 28.

ASSISTANT: Do you have any class preference?

USER: No but I am looking for a flight which is departing in the morning time.

ASSISTANT: Can I know your connection limit?

USER: I prefer to travel in a single connecting flight.

ASSISTANT: Do you have any other specifications?

USER: No, thanks a lot for asking.

ASSISTANT: May I know your name please?

USER: Sure, I am Kimberly Carter.

ASSISTANT:  Sorry, there are no flights in this route as per your travelling details.

USER: It's ok, not a problem with that. Thank you for searching the flights for me.

ASSISTANT: Thank you for reaching us, have a great day.

USER: You are welcome.