You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Patrick Hall.

ASSISTANT: How can I  help you?

USER: I have a franchise meeting at Francisco this month. Can you please help me in reserving the ticket from PHX to SFO?

ASSISTANT: Can I know your travel dates?

USER: I am willing to leave on June 18 and again I will return back on June 20.

ASSISTANT: Sorry, no flight found with your travelling dates.

USER: Not a big deal, anyway thank you very much for your service.

ASSISTANT: Thank you.