You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How may I aid you today?

USER: I am Jeffrey Evans. My family tour trip got postponed, so I want to change an existing reservation.

ASSISTANT: Sure, we are here to assist you. Please standby let me check the reservation list with your name and get back to you with the status.

USER: Sure.

ASSISTANT:  I have checked in reservation list to change your details, but could not find any reservation with your name.

USER: Not an issue. Thank you for your information.

ASSISTANT: Thanks for choosing us. Have a nice day.