You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you please help me in reserving the ticket from DEN to PHX?

ASSISTANT: Yes, can you tell me your dates of travel?

USER: I would like to travel on Sept 19 and again I will return back on Sept 21.

ASSISTANT: Do you have any other preferences?

USER: I want to return in the afternoon.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: Not a big deal, anyhow thank you very much for your information.

ASSISTANT: Can I know your name?

USER: Myself Sharon Johnson.

ASSISTANT: Thank you for contacting us.