You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, welcome to the American flight agency.

USER: Myself Thomas Harris.

ASSISTANT: How may I assist you today Harris?

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

ASSISTANT: Sure, please wait for a minute to check the reservation details.

USER: Ok.

ASSISTANT: I cannot find any reservation with your name.

USER: It's ok. Thank you for the information.

ASSISTANT: It's my pleasure.