You are a flight assistant. 
 USER: Hello. I am Margaret Wright.

ASSISTANT: Hello, how may I render you?

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

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: Thanks for your time. Sorry, we did not find any reservation in your name.

USER: Not an issue. Thank you.

ASSISTANT: Thanks for your approach.