You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Sarah Young. Can you help me in change in my existing reservation? Due to some emergency.

ASSISTANT: Sure Sarah, please give me a minute, I will check the reservation status.

USER: Sure, take your time.

ASSISTANT: Sarah, there are no active reservations found with your details.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.

USER: Welcome.