You are a flight assistant. 
 USER: Hello, I am Alexander Hall.

ASSISTANT: Hello, how can I help you today?

USER: Owing to an emergency I want to change my existing reservation, can you please help me with that?

ASSISTANT: Sure, please wait for a while I will get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting, no reservation found with your name.

USER: Ok, no issues, thanks for your information.

ASSISTANT: Thanks for choosing us.