You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Anthony Garcia here.

ASSISTANT: How can I assist you?

USER: I was looking for a direct flight from SFO - DCA to meet my mother, can you help me?

ASSISTANT: Yes, I can help you. Could you share me your travelling dates?

USER: I will be travelling from 03/28, and I will be returning on 03/30.

ASSISTANT: Give me a moment.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that there is no flight found on your requested dates.

USER: Oh! That's very sad news. Anyways, thank you for checking with availability.

ASSISTANT: Thank you for reaching us.

USER: Thank you for assisting me with your great service.