You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Ashley Clark. Due to some problems I am unable to travel in flight so can you please cancel my flight ticket?

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

USER: Ok, thank you for your positive response.

ASSISTANT: I have successfully cancelled your ticket.

USER: Thank you for your help.

ASSISTANT: Welcome.