You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I am Patrick Garcia from IAH, I want to attend a business meeting. Can you make a reservation for me?

ASSISTANT: Sure, when you are willing to travel?

USER: I am willing to travel on 12/31 and return to IAH on 01/02.

ASSISTANT: Ok, can I know your destination code?

USER: I want to travel to PHL.

ASSISTANT: Ok, wait for a minute.

USER: Sure, please take your own time.

ASSISTANT: Sorry Patrick, no flight's available based on your travelling dates.

USER: It's ok.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your help.

ASSISTANT: Have a nice day.