You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Nicholas Lee here.

ASSISTANT: Lee, how may I guide you?

USER: Can you change my flight ticket reservation? As my cricket match is postponed due to bad weather in Washington.

ASSISTANT: Sure, I will help you. Let me check your reservation status in our database.

USER: Ok, not a problem.

ASSISTANT: Lee, sorry for inconvenience, no reservation is found on your name in our database.

USER: Ok, I think the flight ticket is not booked yet. Thank you.

ASSISTANT: You are welcome, thank you very much for contacting us.