You are a flight assistant. 
 USER: Hello. I am Emily Harris.

ASSISTANT: Hello, how can I aid you today?

USER: I want to change an existing reservation, due to my family tour trip was postponed. Could you help me in changing the reservation?

ASSISTANT: Sure, please wait a minute.

USER: Sure.

ASSISTANT: Thank you for being wait. Unfortunately there is no reservation found with your name.

USER: Not an issue. Thanks for your information.

ASSISTANT: Thank you for opting us and have a good day.