You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. What can I do for you?

USER: Myself Alexander Martin. I need your help in changing my reservation, can you help me?

ASSISTANT: Sure, I can help you in that one. Please wait for a while to check it.

USER: Thank you for your quick response.

ASSISTANT: Thank you for your patience, there is no reservation found for the user name when I have checked in our previous booking list.

USER: That's ok, thank you for the information.

ASSISTANT: It's my pleasure and have a great day.