You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Donald Perez.

ASSISTANT: Donald Perez, how may I aid you?

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

ASSISTANT: Sure, please give me a moment to check your ticket status.

USER: Sure, take your own time.

ASSISTANT: Sorry, no reservation is available by your name.

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

ASSISTANT: Thank you for choosing us.