You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How may I help you?

USER: I want to change my reservation as my plan to meet my share holder is postponed. Can you help me?

ASSISTANT: Please provide your name.

USER: Raymond Lewis is my name.

ASSISTANT: No reservation exists by name Raymond Lewis.

USER: Ok, may be I have done with some other agency. Anyway thanks for the information.

ASSISTANT: Thanks.