You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Brian Davis.

ASSISTANT: How may I guide you?

USER: Owing to an emergency, I would like to cancel my recent reservation. Will you help me with this?

ASSISTANT: Brian Davis, I am here to help you for this. Let me check your reservation status in our records.

USER: Sure, I will wait for your information.

ASSISTANT: Sorry for inconvenience, no reservation is found with your criteria.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you very much for contacting our agency.