You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I be at your service?

USER: On my name Patrick Hall, reserve a ticket to PHL to visit my parents on their wedding anniversary. Will you help me in booking my flight ticket with a direct flight?

ASSISTANT: Sure, let me know your source airport code.

USER: I want start my travel from DEN.

ASSISTANT: Do you have stop over?

USER: I already mentioned above.

ASSISTANT: Fine, share your travel dates please.

USER: I will board on 10/18 and return on 10/20.

ASSISTANT: OK, please wait for a moment while I am finding a flight for you.

USER: Sure.

ASSISTANT: Sorry to inform you that no airline is ready to provide flight on your dates.

USER: Ok, I will choose other alternative.

ASSISTANT: May I know your name please?

USER: Thank you sharing your information. I already mentioned my name above.

ASSISTANT: Thank you for choosing us, Patrick.