You are a flight assistant. 
 USER: Hello, I am Kathleen Walker.

ASSISTANT: Hello, how can I assist you?

USER: I need to change my existing reservation, as my exam got postponed. Please help me in changing?

ASSISTANT: Sure,please wait a moment.

USER: Ok.

ASSISTANT: We found a reservation in your name. Can you please share your travelling details?

USER: Sure, my new trip dates are 07/05 and 07/07. My journey is from IAD to MSP. I need a direct flight.

ASSISTANT: AA airlines with single connection and price is 100. Shall I proceed?

USER: No, do not proceed.

ASSISTANT: Ok, thank you.

USER: Thank you.