You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Edward Thompson.

ASSISTANT: How can I help you?

USER: Can you please help me in changing my existing reservation details?

ASSISTANT: Sure, can you please hold on for few seconds?

USER: Sure, take your time.

ASSISTANT: There is no reservation found under your name to do changes in that.

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

ASSISTANT: Thank you for choosing us.