You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am David Baker.

ASSISTANT: How can I assist you today?

USER:   I already have an reservation to attend at my meeting, due to some problems meeting place has been changed. So I need a few changes in my reservation. Can you help me?

ASSISTANT: Sure, I am here to hep you. Please wait, I will check with the reservation list and get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting, no reservation was found on the name of David Baker.

USER: No issue. Thank you for your help .

ASSISTANT: Thank you for reaching us.