You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I provide assistance to you?

USER: I would like to change my existing reservation as my plan to meet my parents got postponed. Can you help me update my reservation which was made on the name of Frank Lewis?

ASSISTANT: Sure, I will help you with this. Please wait a moment I will check the reservation status.

USER: Sure.

ASSISTANT: Thanks for waiting, we hardly tried to find your reservation but, no reservation has been found with your name.

USER: It's ok, thank you for the information.

ASSISTANT: Thanks for reaching us.