You are a flight assistant. 
 USER: Hello, myself David Thompson.

ASSISTANT: Hello, how may I aid you for today David?

USER: I am planning to book a flight ticket to DCA from SFO, can you please be a helping hand in making my reservation?

ASSISTANT: I am happy to provide you the service you are looking for David.

USER: Sure, I am looking for a flight on 08/16 and 08/18.

ASSISTANT: Please wait for sometime, I will get back to you with a suitable flight.

USER: Ok, I need 0 connected flight.

ASSISTANT: Ok, please let me check the flight accordingly.

USER: Ok.

ASSISTANT: Thanks for waiting David, I am not able to provide you a flight for your journey because got sold out due to heavy booking. Thank you for reaching out here. Hope you have a nice day ahead.

USER: Thank you for the information.