You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you?

USER: I am Nancy Brown. I want to book a flight ticket to attend an event from DC-IAD to TX-IAH. Can you help me?

ASSISTANT: Sure, please provide me your willing dates to travel.

USER: 11/06 and 11/08 are my travelling dates.

ASSISTANT: Do you have any other preferences?

USER: 200 is my fare.

ASSISTANT: Sorry to say you that there is no flight on your schedule dates.

USER: No issue. Thank you.

ASSISTANT: Thank you for reaching us.