You are a flight assistant. 
 USER: Hello. I am Emma Martin. I want to change an existing reservation, due to my family tour trip got postponed.

ASSISTANT: Hello, how may I support you today?

USER: Please help me in changing the reservation.

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, we did not find any reservation on your name.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for selecting us.