You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I provide assistance to you at this time?

USER: I am Charles Roberts, want to travel from DEN to DCA to attend a conference meeting. Will you please help me in booking my ticket?

ASSISTANT: Could you please help me with providing your corresponding travelling dates?

USER: Thank you for taking my request into consideration. I am planning to leave on 10/11 and please book my return ticket also on 10/13.

ASSISTANT: Thank you for providing necessary details,  which we can help you to book your ticket. Please be on hold I will let you know the information.

USER: Sure, please search for a direct flight for me.

ASSISTANT: Thank you for waiting, sorry to inform you that unfortunately there is no flights available by the given details.

USER: That's fine, no issues with that. Thank you for your quick response.

ASSISTANT: Thank you for opting our service. Have a nice day.