You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Anthony Turner. I would like to change my existing reservation, can you please help me in changing?

ASSISTANT: Sure, I will help you. Please wait a moment.

USER: Sure.

ASSISTANT: We are happy to say that we found a reservation on your name. May I know your airport codes?

USER: My airport codes are from LGA to DTW.

ASSISTANT: Please share me your travel dates.

USER: My depart will be on Oct 1st and Oct 3rd.

ASSISTANT: Do you have any specifications?

USER: The depart time should be evening.

ASSISTANT: Sorry, there is no flight on your details.

USER: Ok, no worries at all. Thank you.

ASSISTANT: Thank you.