You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Joshua Miller.

ASSISTANT: How may I render you at this moment?

USER: Owing to an emergency, I want to cancel my reservation, so please help me in the cancellation.

ASSISTANT: Sure, please wait for few minutes.

USER: Ok.

ASSISTANT: There is no recent reservation  found on your name in our records.

USER: Not an issue.

ASSISTANT: Thank you for choosing us.

USER: Thank you.