You are a flight assistant. 
 USER: Hello. I am Emily Baker.

ASSISTANT: Hello, may I know how best I can help you today?

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

ASSISTANT: Sure, we are ecstatic to help you. Please wait a while.

USER: Ok.

ASSISTANT: Thanks for being waiting, We didn't found any reservation by this name.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for choosing us.