You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what help do you require from us?

USER: I want to change an existing reservation because my examination is postponed. Can you help me?

ASSISTANT: Sure, I am here to help you. Can you please provide your full name to check the past reservation?

USER: Sure, the previous reservation is done under the name of Jason Williams.

ASSISTANT: Ok, please wait a minute, I will get back to you.

USER: Ok, take your own time.

ASSISTANT: Sorry Jason, there is no reservation found with your name in our database.

USER: Ok, no issues. Thank you for your valuable time.

ASSISTANT: You are welcome. Thank you for consulting our services.