You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I already book a reservation to visit Houston city but due to flood at there I plan to postponed my trip. Can you change my reservation?

ASSISTANT: Sure, can you please provide your name?

USER: My name is Sharon Martinez.

ASSISTANT: Wait a minute.

USER: Sure.

ASSISTANT: Sorry, we could not find any reservation on your name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for approaching us.