You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Catherine Parker.

ASSISTANT: How can I help you, Parker?

USER: I would like to change my existing reservation, please help me out.

ASSISTANT: Sure, please wait for a minute. I will search for the status of your reservation.

USER: Sure, take your time.

ASSISTANT: Parker, there is no reservation found with your details.

USER: Ok, no issue. Thank you for your information.

ASSISTANT: Thank you for contacting us.