You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Rebecca Lewis.

ASSISTANT: How may I help you?

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

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation matching with your name in our portal.

USER: No problem, thank you for the information.

ASSISTANT: Most welcome.