You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Melissa Adams.

ASSISTANT: How can I assist you today?

USER: Owing to an emergency I want to cancel my recent reservation, can you please help me with this?

ASSISTANT: Sure, I can help you with that. Please wait for a while.

USER: Ok.

ASSISTANT: Melissa Adams, there is no reservation found under your name in our database to do cancellation.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for choosing us, have a nice day.