You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My exam got postponed, I would like to change my existing reservation. Please help me out.

ASSISTANT: Sure, may I ask you for your name please?

USER: My name is Brandon Adams.

ASSISTANT: Please give me a moment.

USER: Sure, take your time.

ASSISTANT: Brandon Adams. I regret to inform that there is no reservation by your name.

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

ASSISTANT: Thank you for reaching us.