You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I render you?

USER: I want to change my existing reservation under the name of Christine Baker. Can you help me in this?

ASSISTANT: Sure, we are glad to help you.

USER: Thank you.

ASSISTANT: Please wait for a minute, I will check and let you know the status of your existing reservation.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, sorry to say that there is no reservation found on your name.

USER: That's alright, not a problem. Thank you for your information.

ASSISTANT: Thank you for choosing our airlines.