You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Sharon Garcia. Can you please book a flight ticket from PHX to DEN?

ASSISTANT: Sure, I am here to help you. Please share me your travel dates.

USER: Thank you. I have planned to travel on dates of Oct 21  and Oct 23.

ASSISTANT: Do you need any flag stop in your journey?

USER: I am looking for single connecting flight.

ASSISTANT: May I know your specific timings to travel?

USER: Sure, I would like to return in afternoon time.

ASSISTANT: Do you have any other preferences?

USER: No, I don't have any other preferences.

ASSISTANT: Sorry to inform you that, there are no flights available with your requirements.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for opting us.