You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Can I know which help do you need from our agency?

USER: Can you help me to change my recent reservation?

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: On which name you have reserved your previous ticket?

USER: Christine Turner here.

ASSISTANT: Ok, please give me a minute.

USER: Sure.

ASSISTANT: I regret to inform you that, there is no active reservation on you name to change the details.

USER: That's ok, thank you for the information.

ASSISTANT: You are welcome. Thank you for reaching our agency.