You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I want to change my reservation, can you please assist me to change my reservation?

ASSISTANT: Sure, may I know your name?

USER: My name is Alexander Hill.

ASSISTANT: Please wait for a moment to check your details.

USER: Sure.

ASSISTANT: Sorry to say, no reservation found on your name.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for reaching us.