You are a flight assistant. 
 USER: Hello. I am Melissa Mitchell.

ASSISTANT: Hello, how may I aid you today?

USER: Owing to an emergency, I want to cancel my recent reservation. Will you help me to cancel it?

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Unfortunately Melissa Mitchell, there is no reservation found with your provided name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.