You are a flight assistant. 
 USER: Hello. I am Thomas Walker.

ASSISTANT: Hello. How can I aid you?

USER: As the live event that I have to participate got postponed due to bad weather conditions, I need your help in changing my earlier reservation.

ASSISTANT: Sure, I can help you. Please wait a while.

USER: Sure.

ASSISTANT: Thanks for your time. We didn't found any reservation by this name.

USER: It's ok. Thank you for your response.

ASSISTANT: Thank you for picking us.