You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am David Gonzalez.

ASSISTANT: How shall I oblige  you now?

USER: I need to cancel my recent reservation, due to heavy rainfall my scheduled examination dates has been postponed.

ASSISTANT: Ok.

USER: Can you please help me with cancellation?

ASSISTANT: Please wait a while.

USER: Ok.

ASSISTANT: Thanks for being patience. We did not find any reservation on your name.

USER: OK, not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.