You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Benjamin Parker.

ASSISTANT: How can I help you at this moment?

USER: Can you help me in changing my recent reservation?

ASSISTANT: Sure, I am here to help you. Please give me a moment to check your reservation status.

USER: Sure.

ASSISTANT: Benjamin Parker, I have found your reservation. Please provide your airport codes of journey.

USER: My airport codes are from ATL to ORD.

ASSISTANT: May I know your planned dates of journey?

USER: My planned dates are from Sept 30 to Oct 2.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: May I know your specific depart and arrival timings?

USER: I want to depart in the morning time.

ASSISTANT: Do you have any airline preference?

USER: No.

ASSISTANT: Benjamin Parker, there are no flight services are available on this route on your provided dates.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for opting us.