You are a flight assistant. 
 USER: Hi. I am William Turner.

ASSISTANT: Hello, how can I help you?

USER: I have promised my children to take them to Children's Museum of Washington on this weekend. Can you help me with booking?

ASSISTANT: Sure, please share me your travelling dates?

USER: 11/14 and 11/16 are my travelling dates.

ASSISTANT: Kindly mention me your airport codes?

USER: PHL is my origin and DCA is my destination.

ASSISTANT: Thanks for your details. Sorry, there are no flights with your specifications.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thank you for reaching us.