You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am planning to visit Downtown Aquarium at Houston, could you please help me with booking a flight ticket from DCA to HOU?

ASSISTANT: Sure, I will help you. Can I have your name?

USER: I am Robert Wright.

ASSISTANT: Could you please share your planned journey dates?

USER: I would like to depart on Jan 24th and return on Jan 26th.

ASSISTANT: Let me know your connection limit.

USER: I am looking for a connecting flight.

ASSISTANT: Which class would you prefer for your journey?

USER: I am comfortable with any class.

ASSISTANT: Do you have any time concern?

USER: Make sure that my return time must be morning.

ASSISTANT: Give me a minute, I will let you know the flight availability.

USER: Sure, take your time.

ASSISTANT: Thank you for your time. There were no flights available that matches your requirements.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for availing us.