You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Melissa Lopez. My plan to visit white house has been postponed, can you help me in changing my reservation?

ASSISTANT: Sure, We are here to help you. Please hold on a moment. I will check the status and let you know.

USER: Well, I will be waiting.

ASSISTANT: Thanks for your valuable time. There was no reservation found on your name.

USER: Not an issues, I will find other alternative. Thank you for your quick response.

ASSISTANT: Thank you for contacting us.