You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: Can you please help me in changing my existing reservation? As I would like to change to my trip dates.

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Can I have your name please to check your reservation status?

USER: My name is Deborah Martin.

ASSISTANT: Ok, please wait a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry Deborah Martin, no reservation has found under your name to change.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for choosing us, have a good day.