You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Due to heavy rainfall my business tip has been postponed.Can you please help me for changing the existing reservation?

ASSISTANT: Sure, I will help you in this condition.

USER: Thank you.

ASSISTANT: Ok, could you please help me with your name for further process?

USER: Sure, my name is Raymond Jones.

ASSISTANT: Sure, please wait for a moment.

USER: Ok, take your time.

ASSISTANT: I found a reservation for you, can you please help me with your airports codes for further process?

USER: Sure, the airport codes are from TX-DFW to CA-OAK.

ASSISTANT: Ok, may I know your dates of trip please for further process?

USER: The travelling dates are from 10/19 to 10/21.

ASSISTANT: Please wait for a mean while.

USER: Sure, make sure that the connection limit should be 0.

ASSISTANT: Sorry Jones, there is no flight is available as per your travelling details.

USER: No problem, I will search with another flight to complete my trip.

ASSISTANT: Ok, thank you for your information.

USER: Thank you.

ASSISTANT: You are welcome.