You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I support you?

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

ASSISTANT: Sure, we will help you. May I know your name please?

USER: Yes, my name is Helen Martin.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for your time, no reservation was found on your name.

USER: That's fine, thank you for the response.

ASSISTANT: Thanks for choosing us.