You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Melissa Adams here.

ASSISTANT: How can I assist you?

USER: Can you please help me in booking a ticket from DFW to DEN?

ASSISTANT: Sure Adams, can I know the travel dates please?

USER: Sure, my journey dates are 09/15 and 09/17.

ASSISTANT: Ok, wait a moment please.

USER: Sure, I'll wait.

ASSISTANT: Sorry, there are no flights available on your dates.

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

ASSISTANT: Thank you for approaching us.