You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Mark Baker here.

ASSISTANT: How can I help you at this moment?

USER: Due to some reason, I am unable to travel. Can you cancel my ticket?

ASSISTANT: Sure, I will help you with this.

USER: Thanks.

ASSISTANT: Mark Baker, there is no active reservation found under your name in our database.

USER: It's ok.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your help.