You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Due to office conference meeting, I am planning to change my existing reservation. Can you please help me for this?

ASSISTANT: Sure, may I know your name?

USER: Myself Debra Wilson.

ASSISTANT: Please give me a moment to check your ticket status.

USER: Sure, I will wait for your response.

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

USER: Not a big problem, anyhow thank you very much for checking the reservation status.

ASSISTANT: Thank you for choosing us.