You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I want to change my existing reservation due to postpone of my live concert event at Austin. Would it be possible to change my existing reservation?

ASSISTANT: Sure, we are here to help you. Please provide your name to proceed further.

USER: I am Emily Harris.

ASSISTANT: Ok, please wait for a moment, I will check the reservation on your name and revert to you.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for being patient, we did not find any reservation on your name to change it.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for contacting us.