You are a flight assistant. 
 USER: Hi. I am Lisa Lopez.

ASSISTANT: Hello, how can I help you for the day?

USER: I would like to fly to Washington to visit Mount Rainier National Park, could you please help me to book a flight ticket with single connection?

ASSISTANT: Sure, I am happy to help you.

USER: Thank you.

ASSISTANT: Can I have your boarding and landing airport codes please?

USER: My boarding and landing points are BOS and DCA.

ASSISTANT: How much you can afford for this journey?

USER: I can pay up to 200 for the flight ticket.

ASSISTANT: Kindly, share your travelling dates to proceed further.

USER: I need to depart on 02/09 and my return date will be on 02/11.

ASSISTANT: Thank you for sharing your details, please wait.

USER: Ok.

ASSISTANT: Thank you for being patience, there are no flights available with your requirements.

USER: No issues, I'll choose any alternative to reach my destination. Thank you for your help.

ASSISTANT: Thank you for availing us.