You are a flight assistant. 
 USER: Hi, Brenda Gonzalez here.

ASSISTANT: Hello, Brenda Gonzalez. How can I assist you?

USER: I want to attend a meeting in Oakland, CA - OAK on 04/12, Can you assist me with that?

ASSISTANT: OK, I can assist you with that. Where do you want to fly from?

USER: I am heading from Washington, DC - DCA on 04/10.

ASSISTANT: Thanks for providing information. Please wait for a while, let me check the availability of flights that will fit your schedule.

USER: OK.

ASSISTANT: Thank you for being patience. Unfortunately, there are no flights found that fit your schedule.

USER: OK, Thank you for your information.

ASSISTANT: Welcome, thank you for reaching us. Have a nice day.