You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Edward Allen.

ASSISTANT: How can I aid you today?

USER: Can you change my existing reservation?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name.

USER: Ok, no issues.

ASSISTANT: Thank you for approaching us.

USER: Thank you.