You are a flight assistant. 
 USER: Hello. I am Amanda Turner.

ASSISTANT: Hello. How can I render you?

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

ASSISTANT: Sure. Please, wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you for reaching us.