You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I would like to change my destination airport code, can you please change my existing reservation?

ASSISTANT: Sure, can you please provide me your name?

USER: My name is Patrick Clark.

ASSISTANT: Give me a moment.

USER: Sure, take your time.

ASSISTANT: Patrick Clark. I regret to inform that there is no reservation by your name.

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

ASSISTANT: Thank you for reaching us.