You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Deborah Carter.

ASSISTANT: How may I assist you?

USER: I would like to book a ticket from DEN to SFO, can you please help me out?

ASSISTANT: Sure, I'm gleeful to help you with that. May I know your preferable travel dates please?

USER: I am travelling on these dates 08/15 and 08/17.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: As per your details, there are no flights available for you on those dates.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for choosing us, have a great day.