You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you today?

USER: As my tournament got postponed, can you help me to change my existing reservation?

ASSISTANT: Sure, I will help you. Can you please provide your name to check your previous reservation?

USER: Sure, my name is Sharon Collins.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: We regret that, there is no reservation found with your name in our records.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us, have a great day.