You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I want to cancel my reservation due to sudden change in my trip, can you assist me?

ASSISTANT: Sure, We are here to help you. May I know your name?

USER: Gregory Martin.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: Thanks for being waiting, We didn't found any reservation by this name.

USER: No problem, thank you for searching.

ASSISTANT: Thank you for reaching us.