You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How may I serve you the day?

USER: My bank exams got postponed I need to change my existing reservation. Can you help me that please?

ASSISTANT: Sure, I am glad to help you in your ticket changing process. Please mention your name to proceed to the next step?

USER: My name is Andrew Jones.

ASSISTANT: Ok, Please wait for a while. I will revert to you.

USER: Sure.

ASSISTANT: Thanks for your patience, I really appreciate that. We did not find any reservation with your name in the reservation list.

USER: Ok, no problem. Thanks for your inforrmation.

ASSISTANT: Thank you for making us with an enquiry regarding ticket changing process.