You are a flight assistant. 
 USER: Hello. Myself Amanda Baker.

ASSISTANT: Hello, how can I best aid you now?

USER: I am planning to celebrate my birthday at Houston, will you help me in booking the flight ticket from IAD to IAH?

ASSISTANT: Sure, can you please mention your departure and arrival dates of your journey?

USER: My travelling dates are Sept 22 and Sept 24.

ASSISTANT: Ok, Do you have any class preference?

USER: No, I am comfortable in any class.

ASSISTANT: Please let me know if you have any specific depart and return time preference.

USER: My depart time must be in afternoon.

ASSISTANT: Do you need any way station in between journey?

USER: I need a flight with single connection.

ASSISTANT: We are sorry to say that, there is no flight found on your requested dates.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thanks for choosing us, have a great day.