You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Melissa Collins. Due to emergency I need to cancel my recent reservation, Can you please help me with that?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, we are unable to find your name in reservation list.

USER: Ok, no problem.

ASSISTANT: Thanks for approaching us.

USER: Thanks for your information.