You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, welcome to Global agency.

USER: Eric Green is my name, I approached you for some help in changing my existing reservation details. Will you help me?

ASSISTANT: Sure, I can help you to change your reservation. Let me check your reserved ticket status in our database.

USER: Ok.

ASSISTANT: Sorry Eric, we could not find a reservation by your name.

USER: Well, may be the booking have mistakes.

ASSISTANT: Thank you for contacting our agency.

USER: Thanks a lot for your response.