You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Christine Gonzalez .

ASSISTANT: Ok. Please provide travelling details.

USER: I would like to travel from Washington to Philadelphia to visit sip of Philly brewery.

ASSISTANT: May I know your travelling dates?

USER: Help me in booking my flight ticket with single connection.

ASSISTANT: Ok.

USER: My travelling dates are from 05/01 to 05/03.

ASSISTANT: Please help me with airport codes.

USER: I would like to travel from DC-DCA to PA-PHL.

ASSISTANT: No flights found for your requirement.

USER: No issues.

ASSISTANT: Thanks.