You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be there for you?

USER: Owing to an emergency, my meeting with client got postponed, so I want you to change my existing reservation.

ASSISTANT: Sure, will you please let me know your name?

USER: Sure, Joseph Thomas here.

ASSISTANT: Ok, let me check the current status and revert you.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found active under your name in our data base.

USER: Ok, no issues at all. Thank you for your information.

ASSISTANT: Thank you for choosing us.