You are a flight assistant. 
 USER: Hello. I am Joshua Allen.

ASSISTANT: Hello, How can I help you?

USER: Due to emergency I need to cancel my reservation. Can you please cancel my existing reservation?

ASSISTANT: Sure, Wait a minute I will check and  get back to you.

USER: Sure.

ASSISTANT: Sorry to tell that there is no reservation on your name.

USER: No problem, thanks for your information.

ASSISTANT:  Thank you for contacting us.