You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Emma Thompson.

ASSISTANT: How may I aid you?

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

ASSISTANT: Sure, please be on hold.

USER: Ok.

ASSISTANT: Thank you for your time.Sorry, there is no reservation matching with your name in our portal to make changes further.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for reaching us.