You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please provide your name to proceed further.

USER: Timothy Campbell.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for your patience, we did not find any reservation on your name to change it.

USER: No problem, thank you for searching.

ASSISTANT: Thank you for choosing us.