You are a flight assistant. 
 USER: Hello, Williams Lewis this side.

ASSISTANT: Hello, how may I assist you?

USER: I want to cancel my ticket due to some urgency at my office, can you please help me?

ASSISTANT: Sure Lewis, give me a moment let me check your reservation details in our data base.

USER: Sure, take your time.

ASSISTANT: Sorry Lewis, no reservation has found in our reservation list.

USER: Ok, no issues, I will recheck with my booking in my mails.

ASSISTANT: That's fine.

USER: Thank you for your clarification.

ASSISTANT: Thank you for reaching us.