You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I have done my reservation last week for my exams in Boston city but due to some technical issue in that university they have changed my exam destination to Washington. Can you please help me to change my reservation?

ASSISTANT: Sure, may I know your name?

USER: Sure, my name is Katherine Walker.

ASSISTANT: Please wait for a moment to check your details.

USER: Sure.

ASSISTANT: Sorry to say, no reservation found on your name.

USER: Not a problem, anyways thank you for the information.

ASSISTANT: Thank you for reaching us.