You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What kind of service do you expect from our agency?

USER: I want to change my existing reservation, due to bad weather conditions. Can you please help me to change my existing reservation?

ASSISTANT: Sure, we are here too help you from our agency.

USER: Thank you.

ASSISTANT: May I know your name to check your previous reservation status?

USER: My name is Patricia Clark.

ASSISTANT: Ok, please give me a moment.

USER: Ok, sure. I will wait for your response.

ASSISTANT: We are happy to inform you that, there is an active reservation on your name. Please let me know your airport codes.

USER: I am very happy to here this from you. My airport codes are EWR and BOS.

ASSISTANT: Can you please share your travelling dates?

USER: My travelling dates are Dec 9th and Dec 11th.

ASSISTANT: May I know your connection limit?

USER: I prefer a connecting flight for my journey.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: Sorry, there are no flights in this route as per your travelling details.

USER: Ok, not a problem. Thanks for the information.

ASSISTANT: Thank you for choosing us.