You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: James Parker here.

ASSISTANT: How may I assist you?

USER: Can you please help me out in booking the ticket from Dallas to Denver? As I'm planning to meet my old friend.

ASSISTANT: Sure, can I have your airport codes please?

USER: Sure, my airport codes are DFW and DEN.

ASSISTANT: Please help me with your travelling dates.

USER: I want to depart from here on 06/30 and return by 07/02.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: James, no flights has been found on your journey dates.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for approaching us.