You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Christine Harris here.

ASSISTANT: Yes, Harris.

USER: I would like to change my reservation because of sudden health issue, so can you please help me out with changing of my reservation?

ASSISTANT: Definitely I will help you with that, please wait a minute.

USER: Sure, take your time.

ASSISTANT: Harris, I have searched for your reservation in our records but I didn't find your reservation.

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

ASSISTANT: Thank you for choosing us.