You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Patrick Martin here.

ASSISTANT: How may I assist you?

USER: I am planning to book my ticket from IAD to HOU. Can you please help me with booking a flight ticket?

ASSISTANT: Sure, I will help you. Can I have your planned travel dates please?

USER: My planned journey dates are from Aug 18 and to Aug 20 in afternoon time.

ASSISTANT: Do you have any specifications?

USER: I need a halt in between my journey and my ticket should be reserved in economy class.

ASSISTANT: Patrick Martin, no flights has been found on your planned travel dates.

USER: Not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.