You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: My name is Amanda Perez. Owing to emergency, I want to change my existing reservation. Please help me in that.

ASSISTANT: Sure, I'll help you in changing an existing reservation.

USER: Thank you.

ASSISTANT: Please wait a moment i will check the reservation status.

USER: Ok.

ASSISTANT: Thank you for waiting, unfortunately there is no reservation found by this name.

USER: Thanks for your information.

ASSISTANT: Thank you for approaching us.