You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Deborah Clark. My trip dates have been postponed, So, I would like to change my recent reservation. Can you help me?

ASSISTANT: Sure, please wait for a moment to check your details.

USER: Ok.

ASSISTANT: No reservation is found on your name. Sorry for inconvenience.

USER: It's fine. Anyway, thank you for your help.

ASSISTANT: Welcome.