You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am willing to change my travel dates because I have to given a wrong dates 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 but I need your name to change that reservation.

USER: Thank you for positive response. My name is Carol Williams.

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

USER: Oh! It is sad to hear from your end. Anyways thank you for checking the ticket status.

ASSISTANT: My pleasure.