You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I would like to go Phoenix to meet my children as they are staying at hostel, So could you please help me with booking a flight ticket?

ASSISTANT: Sure, I can help you with that. May I know your planned departure and return travel dates please?

USER: My journey dates are 07/31 and 08/02.

ASSISTANT: May I know your source and destination airport codes please?

USER: My airport codes are ORD-PHX.

ASSISTANT: Do you prefer stopover in between your journey?

USER: I need only direct flight.

ASSISTANT: May I know your good name please?

USER: Helen Smith here.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates.

USER: No issue, Thanks for the information.

ASSISTANT: Thank you for choosing us, have a nice day.