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

ASSISTANT: Hello, how may I serve you?

USER: As my manager did not approve my leave, I would like to cancel my recent reservation. Can you aid me with this?

ASSISTANT: Sure, let me check the reservation list and revert you.

USER: Sure, take your time.

ASSISTANT: We could not find any reservation by the name you provided.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Welcome.