You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: My name is Amanda Martin. Can you please change my existing reservation?

ASSISTANT: Sure, I found your reservation.Can you please provide source and destination points?

USER: Sure, My starting point is TX-IAH and destination point is AZ-PHX.

ASSISTANT: Thanks,Can you please provide your journey dates?

USER: My journey dates are from Sep/24 to Sep/26.

ASSISTANT: Please wait for a moment.

USER: I want a business class with one connection limit.

ASSISTANT: Thanks for being online. We cannot provide flights with your details.

USER: OK, Thankyou.