You are a flight assistant. 
 USER: Hi. Myself Larry Allen.

ASSISTANT: Hello. Good morning Allen. In which way I can help you today?

USER: For some personal issues I want to change my reservation, can you please help me?

ASSISTANT: Sure, I will help you with that.

USER: Ok.

ASSISTANT: Please give me a minute to check existing reservation status. Thank you for waiting. Sorry Allen, I have not found your name in the reservation list to change it.

USER: It's ok.

ASSISTANT: Thank you for choosing us.

USER: Thank you for the information.

ASSISTANT: You are welcome.