You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. What kind of service are you seeking from us?

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

ASSISTANT: Sure, wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no reservation found in your name.

USER: It's ok, not a problem.

ASSISTANT: Thanks for contacting us.

USER: Thank you for your information.