You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: Please assist me in changing my earlier reservation that I have made earlier to meet my friend.

ASSISTANT: Sure, please let me know your name?

USER: I am Catherine Lewis.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, no reservation found with your name to change your reservation.

USER: Ok, Thank you.

ASSISTANT: Thank you for contacting us.