You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: As my plans to visit Houston got postponed, can you please help me in changing my existing reservation to Houston?

ASSISTANT: Sure, please share your name to check your existing reservation.

USER: My name is Lisa Mitchell.

ASSISTANT: Please wait for a while.

USER: Sure, I will wait for your information.

ASSISTANT: Lisa Mitchell, no reservation found with your name is our system to change.

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

ASSISTANT: Thank you.