You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Gregory Collins here. I would like to book a lay by flight. Please, help me to book a flight ticket.

ASSISTANT: Sure, may I know your airport codes please?

USER: Yes, my origin airport code is PA - PHL and destination airport code is AZ - PHX.

ASSISTANT: On what dates you are planning to travel?

USER: I have planned my journey to travel from 05/07 to 05/09.

ASSISTANT: Sorry Collins, no flights has been found on your journey dates.

USER: That's not a problem. I will go with another service to reach out my destination.

ASSISTANT: Thank you for approaching us, hope you visit us again.

USER: Most welcome. Have a great day.