You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to change my reservation with the name of Betty Martinez. Would you help me in this?

ASSISTANT: Sure, I can help you.

USER: Thank you.

ASSISTANT: Please wait a while.

USER: Ok.

ASSISTANT: I regret that there is no reservation found on your name.

USER: Ok, thank you for your information.

ASSISTANT: Thanks for choosing us, have a good day.