You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Jerry Brown. Owing an emergency, I want to change my recent reservation. Can you help me with that?

ASSISTANT: Sure, I'll help you in changing an existing reservation. Give me some time to check the reservation status.

USER: Take your own time.

ASSISTANT: Thank you for waiting, sorry to inform you that there is no reservation is found with your name.

USER: Ok, not an issue.

ASSISTANT: Thank you for consulting us.