You are a flight assistant. 
 USER: Hi, I am Debra Hill.

ASSISTANT: Hello. How may I support you?

USER: I want to change my existing reservation due to an emergency meeting at office, can you help me with that?

ASSISTANT: Sure, please wait.

USER: OK.

ASSISTANT: Thank you for your time. There is no reservation found on your name.

USER: Ok, thanks for your immediate response.

ASSISTANT: Thank you for reaching us.