You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Margaret Nelson.

ASSISTANT: How may I help you?

USER: Actually I booked a ticket to attend a football match, but due to bad weather the match is postponed. Could you help me in changing the reservation?

ASSISTANT: Sure, please wait for a minute to check your past reservation. No reservation found on your name in my database.

USER: That's ok.

ASSISTANT: Sorry for inconvenience.

USER: Thank you for your time.

ASSISTANT: You are welcome.