You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am trying to change my details in the past ticket because my examination is postponed. Can you help me in changing the ticket?

ASSISTANT: Sure, I will help you with changing your reservation.

USER: Thank you.

ASSISTANT: Can I have your good name to check reservation status?

USER: My name is Mark Jones.

ASSISTANT: Ok, please wait a moment.

USER: Ok, I will wait for your response.

ASSISTANT: Thank you for waiting. Sorry Jones, there is no reservation found under your name to change.

USER: It's ok, anyway's thank you for the information.

ASSISTANT: My pleasure. Thank you for choosing us, have a good day.

USER: Thank you.