You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you help me in changing my recent reservation, as my exam is postponed?

ASSISTANT: Sure, I am here to help you with your concern. May I know your name to check with the status?

USER: I am Donald Walker.

ASSISTANT: Please wait a moment while I check with the status.

USER: Sure.

ASSISTANT: Thank you for waiting. Donald Walker, regret to inform that there is no active reservation found under your name to amend.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.