You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. What can I do for you?

USER: As my sister's marriage was preponed,  I need to cancel my recent reservation.

ASSISTANT: Ok. Please let me know your name.

USER: My name is Patrick Walker.

ASSISTANT: Wait for a minute. I will check and let you know the details.

USER: Sure.

ASSISTANT: Thanks for your time. We found that there was no reservation found on your name.

USER: Ok, Thanks for your information.

ASSISTANT: Thanks for your assistance.