You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I need to change my recent reservation due to some issues, can you help me in doing that?

ASSISTANT: Sure, I will help you with that. May I know on which name your reservation was done?

USER: I am Rachel Johnson.

ASSISTANT: Please wait for a moment, while I check for your reservation.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name in our system data.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for visiting us, we hope see you again.