You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I am David Thompson, my holiday trip got postponed to next week. Can you help me to change my reservation?

ASSISTANT: Sure David, I will help you with this.

USER: Please go ahead and check my details.

ASSISTANT: Please wait a moment.

USER: Sure, take your time.

ASSISTANT: Sorry David, no reservation found on your name.

USER: That's fine. Thank you for your help.

ASSISTANT: Welcome, thank you for reaching us.