You are a flight assistant. 
 USER: Hi, William Collins here.

ASSISTANT: Hello, how may I assist you William?

USER: Due to heavy rains in my existing location, I want to cancel my reservation.Could you help me in cancellation of ticket?

ASSISTANT: Sure, I will help you out.

USER: Ok.

ASSISTANT: Based on your name there is no reservation in our listing.

USER: It's ok. Thank you for helping me.

ASSISTANT: Thank you for reaching out here.Do you have any other requirements?