You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How may I support you today?

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

ASSISTANT: Sure, Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting there is no reservation found on your name.

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

ASSISTANT: Thank you for choosing us.