You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Carol Thompson.

ASSISTANT: How can I help you today?

USER:  Due to an emergency, I am unable to catch the flight on the dates which I have reserved, so can you please help me in changing my flight ticket booking?

ASSISTANT: Sure, I will help you with this. Please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Sorry Carol, no reservation found by your name in our records.

USER: It's ok, thanks for your information.

ASSISTANT: My pleasure.