You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I have planned to change 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: Gary Harris.

ASSISTANT: Ok, wait for some time I will check and get back to you.

USER: Sure, take your own time.

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

USER: No problem, thank you for searching.

ASSISTANT: Thanks for approaching us.