You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,.

USER: I am Deborah Jackson.

ASSISTANT: How may I assist you?

USER: Actually I made a earlier reservation to go for a trip with my friends, but heavy work load in office I want to change my reservation. Can you help me?

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: No reservation exists.

USER: OK. Thank you.

ASSISTANT: Thanks.