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

ASSISTANT: Hello, how can I help you?

USER: Owing to an emergency, I am looking for cancel of my recent reservation. Can you help me out?

ASSISTANT: Sure, please wait a while let me check.

USER: Sure.

ASSISTANT: There is no reservation found on your name, Melissa Thomas.

USER: That's ok. Anyways, thank you for helping me.

ASSISTANT: You are welcome.