You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How may I assist you?

USER: I am Michelle Brown. Owing to an emergency, I want to change an existing reservation. Could you help me in changing the reservation?

ASSISTANT: Sure, please wait for a minute. I will get back to you.

USER: Sure.

ASSISTANT: Thanks for being patience, we did not find any reservation with your name.

USER: Not an issue.

ASSISTANT: Thanks for approaching us.