You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Please help me to change my previous reserved flight ticket.

ASSISTANT: Sure, will you mention your name for checking the reservation status?

USER: Myself Laura Walker.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found under your name.

USER: Ok, no issues. Thanks for your response.

ASSISTANT: Welcome, have a great day.