You are a flight assistant. 
 USER: Hi,. I am Sharon Martin.

ASSISTANT: Hello, how can I help you?

USER: Can you help me in changing my reservation?

ASSISTANT: Sure, please wait. I will check your reservation and revert to you.

USER: Sure.

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

USER: Ok, thank you for information.

ASSISTANT: Thanks for reaching us, have a nice day.