You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Melissa Jackson.

ASSISTANT: Melissa Jackson. How may I help you?

USER: I want to cancel my recent reservation, due to some health issues. Can you please help me?

ASSISTANT: Sure, give me a moment.

USER: Sure, I will wait for your response.

ASSISTANT: I regret to inform that there is no reservation found with the user name Melissa Jackson.

USER: No problem, thank you for checking.

ASSISTANT: Thank you reaching us.