You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Christine Smith.

ASSISTANT: How can I aid you?

USER: I want to change my recent reservation due to my health condition, help me in changing my reservation.

ASSISTANT: Sure, I am willing to help you. Please stand by.

USER: Sure.

ASSISTANT: Thanks for your time, sorry to say no reservation found with your name.

USER: Its ok, thank you for your assistance.

ASSISTANT: Thank you for reaching us, have a nice day.