You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Margaret Williams here.

ASSISTANT: What type of help that you need from my side?

USER: Actually, I am looking for a flight having single connection because my friend also booked the same flight that I want to travel, so can you please help me out with booking of a flight ticket from Austin on 11/07?

ASSISTANT: Is there any return trip that you are planning to book the ticket?

USER: Yes, please book my return ticket on 11/09.

ASSISTANT: Can you provide your source and destination region airport codes?

USER: I would like to travel from AUS to DCA.

ASSISTANT: Please give me a moment so that I can check the flight on your dates.

USER: Ok, take your time. Oh.

ASSISTANT: There are no flights that are travelling on the dates which you have mentioned.

USER: Oh! So sad to hear that. Anyway, thank you for the information.

ASSISTANT: You are most welcome.