You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Jessica Martin. My family tour trip got postponed, so I want to change my existing reservation. Could you help me in changing the reservation?

ASSISTANT: Sure, please wait for a minute.

USER: Ok.

ASSISTANT: I am sorry to inform that there is no reservation found with your name.

USER: Not an issue. Thank you.

ASSISTANT: Thanks for availing us.