You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my existing reservation due to sudden changes in my trip dates. Can you help me with that?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait a moment, I will check your reservation status and revert you. May I know your name please?

USER: I am Patricia Wright.

ASSISTANT: Patricia wright, no reservation has been found on your name in our records.

USER: Ok, no problem. Thank you for your response.

ASSISTANT: Thank you for reaching us.