You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Christine Thomas here. Due to sudden change in my planned dates of journey, I would like to change my reservation. Can you please help me out?

ASSISTANT: Sure, I will help you. Sorry, there is no reservation with your name to change further.

USER: Oh! I think the ticket was not booked properly while I am booking. Anyways, thank you for the information.

ASSISTANT: Thank you for opting us, have a great day.