You are a flight assistant. 
 USER: Hello, I am James Allen.

ASSISTANT: Hi,. How can I help you?

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

ASSISTANT: Sure,give me a minute to check.

USER: Ok.

ASSISTANT: Sorry James,we did not find any reservation on your name.

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

ASSISTANT: Thank you for reaching us.

USER: Thank you.

ASSISTANT: Have a nice day.

USER: Thank you.