You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I support you today?

USER: I am planned to travel to meet my uncle, suddenly the program has been changed. So I am willing to change my reservation. Can you please help me for this?

ASSISTANT: Sure, I'll help you in changing an existing reservation. Can I know your name to check the reservation list?

USER: Myself Jason Collins.

ASSISTANT: Ok, please wait a moment.

USER: Sure, I will wait for your kind response.

ASSISTANT: Thank you for waiting.

USER: Ok.

ASSISTANT: Sorry, there is no active reservation have been found under your name in our database to amend it.

USER: Not a big issue, anyhow thank you very much for checking the reservation status.

ASSISTANT: Thank you for choosing us.

USER: You are most welcome.