You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: My name is Frank Hall, I want to book a flight ticket from DFW to IAD, can you help me?

ASSISTANT: Sure, I will help you with that. Can you please share your preferable journey dates?

USER: Thank you. My journey dates are Aug 07 and Aug 09.

ASSISTANT: Do you have any class limit?

USER: No.

ASSISTANT: Is there any connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any specifications?

USER: My return time is evening.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.