You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I want to change my reservation, can you please help me?

ASSISTANT: Sure, may I know your good name?

USER: My name is Christine Thomas.

ASSISTANT: We found a reservation on your good name. Please share me your source and destination points.

USER: My airport codes are PHX and CLT.

ASSISTANT: May I know your planned travel dates?

USER: My travelling dates are Dec 02 and Dec 04.

ASSISTANT: Is there any class preference for you?

USER: No.

ASSISTANT: Do you have any other specifications?

USER: I need a direct flight.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for reaching us.