You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Can you please assist me to modify my existing reservation?

ASSISTANT: Sure, please mention your name.

USER: I am Larry Edwards.

ASSISTANT: Ok, please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, we did not find any reservation on your name in our database.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.