You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I'm planning to meet my old friends, can you please book the ticket from IAH to IAD?

ASSISTANT: Sure, may I know your planned travel dates?

USER: I would like to depart from my source location on 10th July and I want to return back by 12th July.

ASSISTANT: May I know your connection limit?

USER: I prefer single connected flight.

ASSISTANT: Is there any class preference for you?

USER: I'm ok with any class.

ASSISTANT: Do you have any other specifications?

USER: I prefer normal-cost airlines to travel.

ASSISTANT: May I know your good name?

USER: My name is Edward Thomas.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Oh! That's ok, thank you for giving the information anyways.

ASSISTANT: Thank you for reaching us.