You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Jacob Mitchell.

ASSISTANT: How can I assist you today?

USER: Can you please help me in changing my reservation as my exams got postponed?

ASSISTANT: Sure, will you please give me a moment?

USER: Ok.

ASSISTANT: Thanks for waiting, your reservation found. Will you mention your travelling dates please?

USER: My travel dates are from Oct 27 to Oct 29.

ASSISTANT: Please provide your airport codes.

USER: I would like to start from IAD to reach ORD.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight.

ASSISTANT: Do you have any preferences about class?

USER: No, I want to depart in the morning.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: There is no flights found under your preferable details.

USER: Ok, no problem. Thank you.

ASSISTANT: Welcome, have a great day.