You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Jessica Campbell here.

ASSISTANT: Campbell, how may I guide you?

USER: Can you cancel my flight ticket reservation? As my business trip is postponed due to change in the dates.

ASSISTANT: Sure, I am here to help you. Let me check your reservation status in our database.

USER: Sure.

ASSISTANT: Campbell, sorry to inform that. No reservation is found on your name in our database.

USER: Ok, may be it is already been cancelled by my friend. Thank you.

ASSISTANT: You are most welcome, thank you Campbell for contacting us.