You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Andrew Martin.

ASSISTANT: How may I assist you today?

USER: I have to change my flight ticket reservation that I am unable to travel the trip, can you please help me in flight ticket modification?

ASSISTANT: Sure, I am here to help you, please wait for a minute.

USER: Thank you for considering my request.

ASSISTANT: Sorry, I could not find any reservation with your name in our database.

USER: Ok, that's fine. No issues with that one. Thank you for your quick service.

ASSISTANT: Welcome.