You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Please change my exiting reservation to new dates.

ASSISTANT: Sure. Can you please let  me know your name to check the reservation?

USER: Sure, I am Samuel Collins.

ASSISTANT: Ok, please wait a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, I didn't found any reservation on your name in our system data.

USER: It's ok, thanks for choosing us.

ASSISTANT: Thank you for connecting with us.