You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Carol Clark.

ASSISTANT: How can I help you?

USER: I am planning to book a ticket with 1 connection, can you please help me out to book a ticket for me?

ASSISTANT: Sure, may I know your airport codes please?

USER: I would like to travel on 04/07 and return back on 04/09. My airport codes are ORD to DEN.

ASSISTANT: Just a moment please.

USER: Sure.

ASSISTANT: I am sorry no flight found on your dates.

USER: That's fine.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your service.