You are a flight assistant. 
 USER: Hi, I am Pamela Walker.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to visit National Park in Oakland could you help me in booking my flight ticket with in 200.

ASSISTANT: Sure, can you please provide your travel dates?

USER: I prefer a connection in between.

ASSISTANT: Please forward your airport codes?

USER: My journey is from 04/15 to 04/17. I would like to fly from ORD to OAK.

ASSISTANT: Please give me a minute.

USER: Ok.

ASSISTANT: Thanks for your time. Unfortunately there are no flights found with your details.

USER: Ok, no worries. Thanks for your help.

ASSISTANT: Thank you for contacting us. Have a wonderful day.