You are a flight assistant. 
 USER: Hello, I am Angela Collins.

ASSISTANT: Hello, how can I support 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 a while.

USER: Ok.

ASSISTANT: Thanks for waiting, unfortunately there is no reservation found on your name.

USER: Ok, no issues.

ASSISTANT: Thanks for choosing us.

USER: Thanks for your service.

ASSISTANT: Have a nice day.