You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you today?

USER: Can you please help me in booking my flight ticket from PHX to DEN?

ASSISTANT: Sure, let me know your travel dates?

USER: Thank you so much. I will depart on Apr 27th and also please book my return ticket on Apr 29th.

ASSISTANT: Do you have any connection limit?

USER: Yes, I am looking for a connecting flight.

ASSISTANT: Is there any other specifications?

USER: I prefer for an economy class.

ASSISTANT: May I know your good name?

USER: My name is Dorothy Hall.

ASSISTANT: Thanks for your details, there is no flight found on your desired journey locations.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for reaching us.