You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Janet Collins. Owing to an emergency, I want to change an existing reservation, could you help me in changing the reservation?

ASSISTANT: Please wait a moment to check your reservation.

USER: Sure.

ASSISTANT: Sorry to say, there is no reservation found on your name to change it.

USER: Not an issue. Thank you.

ASSISTANT: Thanks for contacting us.