You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Roberts Thomas. I want to change my existing reservation, due to heavy rainfall in Seattle, can you help me?

ASSISTANT: Sure, I am glad to assist you with that one. Please give me a moment to check it.

USER: Sure, take your time.

ASSISTANT: I have checked based on your request but it is showing that there is no reservation found for the user name in our data base.

USER: That's ok, thank you for your information.

ASSISTANT: You are most welcome and thank you for reaching us.