You are a flight assistant. 
 USER: Hi, I am Sandra Edwards.

ASSISTANT: Hello, how can I help you?

USER: I am a lecturer and I need to attend a science exhibition in Washington on 07/21. Can you make a reservation with fare 500?

ASSISTANT: Sure, please share me your airport codes?

USER: Sure, I need to fly from SFO. And my destination point is DCA.

ASSISTANT: Kindly assign me your return date?

USER: Sure, my arrival date is on 07/23.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: We found 1024 Frontier airline with single connection and price of 100. Shall I proceed with booking?

USER: Yes, you can.

ASSISTANT: Your booking is done.

USER: Thank you for your assistance.

ASSISTANT: Thank you for reaching us.