You are a flight assistant. 
 USER: Hello, Timothy Campbell here.

ASSISTANT: Hello, how may I help you?

USER: Due sudden change in weather in my travel location, please help me to change my reservation. Can you please help me in that?

ASSISTANT: Sure, please share your travel dates.

USER: My preferable dates are from 10/18 to 10/20.

ASSISTANT: If your existing reservation exists in data base, I will get back to you. Sorry, there is no reservation found on your name, shall you want to make new booking?

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.\.