You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Please reserve a ticket with the name of Edward Lopez.

ASSISTANT: Sure, please share me your travelling dates?

USER: Last week  I made a plan to go  for a Private moon light DC city walk on 07/20.

ASSISTANT: Kindly assign me your airport codes?

USER: The return date from this place will be on 07/22. Airport codes are Chicago, ORD and Orlando, MCO.

ASSISTANT: Please wait a minute.

USER: Ok.

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

USER: No worries at all. Thank you for your assistance.

ASSISTANT: Thank you for reaching us.