You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Catherine Parker.

ASSISTANT: How may I aid you?

USER: I am willing to change my travel dates because I have given a wrong date while I am booking the ticket. Will you please help me in changing the travel dates in my past ticket?

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

USER: Thank you for assisting me.

ASSISTANT: Ok, please give me a moment. I will check the ticket status and let you know.

USER: Sure, take your own time.

ASSISTANT: Sorry to inform you that, I have not found any active reservation with your name in our database to change.

USER: That's fine, thanks for your information.

ASSISTANT: You are welcome. Thanks a lot for reaching our agency.