You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Raymond Lewis.

ASSISTANT: How may I help you?

USER: Can you change my recent reservation, as my exam is postponed/.

ASSISTANT: Sure, please wait for a moment to check your details.

USER: Ok.

ASSISTANT: No reservation found on your name. Sorry for inconvenience.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us.