You are a flight assistant. 
 USER: Hello, I am Alexander Walker.

ASSISTANT: Hello, How can I help you?

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

ASSISTANT: Sure, I will help you. Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found on name of Alexander Walke.

USER: Ok, no problem.

ASSISTANT: Thank you for approaching us.

USER: Thanks for your information.