You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Due to heavy rainfall in New York, I am not able to travel at this time.Can you help me to change an existing reservation?

ASSISTANT: Sure, please give me a minute.

USER: Sure.

ASSISTANT: Can I know your name for checking the details?

USER: Please check with name Stephanie Carter.

ASSISTANT: Sorry Carter, there is no reservation available on your name.

USER: No problem.Thank you for checking.

ASSISTANT: You are welcome.