You are a flight assistant. 
 USER: Hi. I am Mark Parker.

ASSISTANT: Hello, how can I assist 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 out?

ASSISTANT: Sure, we are here to help you. Wait for some time.

USER: Ok.

ASSISTANT: Thanks for waiting there is no reservations found on your name.

USER: Not an issue. Thank you.

ASSISTANT: Thanks for approaching us.