You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Donald Clark.

ASSISTANT: In what way can I serve you, Donald Clark?

USER: I want to attend a seminar on 01/14 at Washington, IAD. can you help me in booking on 01/13?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Have any price limit for your journey?

USER: I can bare up to 5000.

ASSISTANT: Your source code please?

USER: I am boarding at New York, LGA.

ASSISTANT: Let me know your connection limit, if you have?

USER: I need a direct flight.

ASSISTANT: When you are willing to catch your return flight?

USER: I will be return on 01/15.

ASSISTANT: Would you prefer either business class or economy class?

USER: I am comfortable to travel with any class.

ASSISTANT: Thanks for your details.

USER: Ok.

ASSISTANT: Unfortunately, no flights found on your route due to heavy snow-storm.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for your support to us. Have a pleasant day.