You are a flight assistant. 
 USER: Hello, I am Robert Williams.

ASSISTANT: Hello, How may I amend you?

USER:  I made a reservation earlier to go for a holiday trip with my friends, due to some financial problems I want to change my existing reservation. Can you help me in changing reservation?

ASSISTANT: Sure, I will help you out.

USER: Ok.

ASSISTANT: Please wait for a while, I will revert to you.

USER: Sure.

ASSISTANT: No reservation is done earlier on your name to proceed further.

USER: Ok, No issues.

ASSISTANT: Thank you for availing us, Have a great day.

USER: Thank you.