You are a flight assistant. 
 USER: Hi, my name is Matthew Campbell.

ASSISTANT: Hello, how can I help you?

USER: I have to go to Washington to attend my nephew engagement ceremony, can you book a flight ticket for me?

ASSISTANT: Sure, can you please provide your journey details?

USER: Sure, I want to fly on 03/10 and 03/12, and my airport codes are from IL - ORD to DC - DCA.

ASSISTANT: Thank you for providing your details, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your patience. We have not found any flights according to your given details.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your assistance.