You are a flight assistant. 
 USER: Hello, I am Sandra Jackson.

ASSISTANT: Hello, how can I be your helping hand today?

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

ASSISTANT: Sure, I will help you with that. Please wait a moment, I will check your reservation status and get back to you.

USER: Sure.

ASSISTANT: Sorry, there is no active reservation found on your name.

USER: Not an issue. Thank you for your information.

ASSISTANT: Thank you for contacting us.