You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Gregory Collins.

ASSISTANT: How can I help you?

USER: I am looking for a direct flight, could you please help me with finding a flight ticket with my requirement?

ASSISTANT: Sure Collins, may I know your journey dates please?

USER: I would like to take off on 12/30 and return on 01/01.

ASSISTANT: Please help me with your airport codes.

USER: My source airport code is PHX and destination airport code is ORD.

ASSISTANT: Collins, there are no flights available at this moment.

USER: That's ok, I will find an another alternate way to complete my trip. Anyways, thank you for the information.

ASSISTANT: Thank you for choosing us.