You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I would like to change my reservation, due to bad weather condition at my destination location. Can you please help me out with that?

ASSISTANT: I am willing to help you, please share your name to check your reservation.

USER: Thank you. Myself William Walker.

ASSISTANT: Thanks for your response, wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: There is no reservation found in our database with your name William Walker.

USER: That's ok, no problem. Thank you for checking out.

ASSISTANT: Thanks for reaching us.