You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I am Matthew Edwards. Can you help me in changing my recent reservation, as my exam is postponed?

ASSISTANT: Sure, please wait a moment I will check your details and proceed further.

USER: Ok.

ASSISTANT: Sorry to say, there is no reservation on your name in my website.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us, have a nice journey.