You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you today?

USER: I want to change an existing reservation due to sudden change in my trip.

ASSISTANT: Sure, may I know your good name?

USER: I am Jennifer Baker.

ASSISTANT: Please wait for a moment. I will check and get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting, sorry to say that no reservation was found with your name.

USER: Thank you for your help.

ASSISTANT: Thanks for connecting with us.